[Event "Interzonal-10a"]
[Site "Biel"]
[Date "1976.07.25"]
[Round "11"]
[White "Castro Rojas, Oscar Humberto"]
[Black "Matanovic, Aleksandar"]
[Result "1/2-1/2"]
[WhiteElo "2380"]
[BlackElo "2525"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Be7 6. d4 O-O 7. Bd3 f5 8. exf6 Bxf6 9. O-O Nc6 10. Nxe4 dxe4 11. Bxe4 Nxd4 12. Be3 Bf5 13. Bxf5 Nxf5 14. Bf2 Re8 15. Re1 Qxd1 16. Raxd1 Rxe1+ 17. Bxe1 Re8 18. Rd7 Re7 19. Rxe7 Nxe7 20. b3 Nd5 21. c4 Nc3 22. Bxc3 Bxc3 23. Kf2 h6 24. Ke3 Kf7 25. Nd4 c6 26. Ke4 Kf6 27. Nf5 Bb4 28. h3 h5 29. Nd4 Bc5 30. Nf3 Bd6 31. Nd4 Bc5 32. Nf3 Bd6 33. Nd4 1/2-1/2